Is it possible to select multiple conditional counts across three tables in a single SQL query?

My SQL-fu is too weak for this, and I'm not even sure it's possible in a single SQL call.

Given I have the following tables:

PARTNER +----+--------+ | id | name | +----+--------+ | 1 | bloggs | | 2 | jones | PARTNER MANAGER +----+--------------+------+ | id | partner_id | name | +----+--------------+------+ | 1 | 1 | fred | | 2 | 2 | dave | COMPANY +----+--------------------+--------+----------+ | id | partner_manager_id | name | active | +----+--------------------+--------+----------+ | 1 | 1 | comp1 | true | | 2 | 1 | comp2 | false | | 3 | 2 | comp3 | true | | 4 | 2 | comp4 | true | | 5 | 2 | comp5 | true | | 6 | 2 | comp6 | true |

I'd like to output the following in a single SQL call:

+--------------+--------------------+----------------------+ | partner_name | n_active_companies | n_inactive_companies | +--------------+--------------------+----------------------+ | bloggs | 1 | 1 | | jones | 4 | 0 |

I can join the three tables using two LEFT JOINs but how I can aggregate the counts (with or without the WHERE clause) is eluding me.

Am I barking up the wrong tree, so to speak?

-------------Problems Reply------------

This gets you most of the way there:

SUM(CASE WHEN active THEN 1 ELSE 0 END) AS n_active_companies,
SUM(CASE WHEN active THEN 0 ELSE 1 END) AS n_inactive_companies
GROUP BY partner_manager_id

The rest of your question is basically asking how to join this result to the remaining tables. As you point out, to do this use JOINs.

SUM(CASE WHEN active THEN 1 ELSE 0 END) AS n_active_companies,
SUM(CASE WHEN active THEN 0 ELSE 1 END) AS n_inactive_companies
GROUP BY partner_manager_id
) T1
ON T1.partner_manager_id =

select "Partner Name"
, c1.cnt "n_active_companies"
, c2.cnt "n_inactive_companies"
from partner p
, (select partner_manager_id id, count(partner_manager_id) cnt from company where active = 'true' group by partner_manager_id) c1
, (select partner_manager_id id, count(partner_manager_id) cnt from company where active = 'false' group by partner_manager_id) c2
where =
and =

select as 'partner_name',
sum(case when active then 1 else 0) as 'n_active_companies',
sum(case when active then 0 else 1) as 'n_inactive_companies'
from COMPANY c
join PARTNER_MANAGER pm on c.partner_manager_id =
join PARTNER p on pm.partner_id =
group by

Category:sql Views:0 Time:2010-11-24
Tags: sql

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